From 1996 to 2002, Smith was Executive Director of the
International Fund for Animal Welfare’s (IFAW) Canadian office and a leader in the campaign to create Canada's federal
Species At Risk Act. In 2001, he was simultaneously IFAW's UK Director and led the organization's efforts in the UK and EU parliaments. In 2003, Smith became
Jack Layton’s first Chief of Staff upon Layton's election as leader of the federal
New Democratic Party. He resigned over controversy within the party related to his previous environmental work. As Executive Director of
Environmental Defence Canada between 2003 and 2012, Smith was an early proponent of an environmentalism rooted in new, sustainable, economic models. He was a key proponent of the
Ontario Greenbelt and the
Ontario Green Energy Act and a founding Director of the Greenbelt Foundation. Smith led the efforts to create Canada’s modernized Consumer Product Safety Act and Chemicals Management Plan, which resulted in Canada becoming the first nation in the world to ban
bisphenol A in children's products. With the
United Steelworkers, he founded Blue Green Canada, the first permanent partnership between trade unions and environmental organizations in the country. He was instrumental in the establishment of the Socially and Environmentally Responsible Aggregate (SERA) initiative, the world’s first independently-certified sustainability standard for the global aggregate and concrete industry. Smith was one of the founders of the Strathmere Group. From 2012 to 2021, Smith was Executive Director of the Broadbent Institute. During that time, the Institute became Canada’s pre-eminent progressive policy and training organization with offices in
Montreal,
Toronto,
Ottawa and
Vancouver. The Institute’s media project, PressProgress, became Canada’s most-shared source of progressive news and analysis. Smith is also an advisor to Progress Toronto. In 2021, Smith was announced as the new President of the Canadian Climate Institute. Under his leadership, the Climate Institute solidified its reputation as Canada’s leading climate change policy research organization, publishing independent research and analysis on Canada's climate policy progress, and establishing an annual conference. == Books ==